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format

HTML

HTML is the markup language of the web, structuring text, media and links.

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What is a HTML file?

The markup language browsers render, describing document structure with elements and attributes.

Technical characteristics

Representation
text
Encoding
UTF-8
Lossy
No
Open specification
Yes

History and origin

Introduced
1993
Created by
Tim Berners-Lee
Organisation
W3C / WHATWG

Compatibility

    Browsers: Chrome, Firefox, Safari, Edge.

    Advantages of HTML

    • Reflows to any screen
    • Accessible and semantic
    • No proprietary reader needed

    Limitations to know about

    • External assets may be missing when a page is saved
    • No fixed pagination

    When to use HTML

    • Web pages
    • Email templates
    • Ebook internals

    Convert HTML files

    HTML scores

    Deterministic scores calculated from the structured facts above. Identical facts always produce identical scores.

    Overall score

    83/100

    • Printing score

      100
      • lossless data means no compression artefacts appear at print resolution
      • a broad range of applications read and write it

      Confidence 51% · evidence coverage 50%

    • Editing score

      100
      • lossless data survives repeated open-edit-save cycles without degrading
      • a broad range of applications read and write it

      Confidence 48% · evidence coverage 63%

    • Openness score

      100
      • the specification is published openly
      • an openly specified format can be implemented without a licence negotiation

      Confidence 50% · evidence coverage 100%

    • Archiving score

      97
      • the specification is public, so a decoder can always be rebuilt
      • the specification is published openly
      • it is actively maintained and current
      • an openly specified format can be implemented without a licence negotiation

      Confidence 63% · evidence coverage 89%

    • Longevity score

      96
      • it is actively maintained and current
      • the specification is published openly
      • the specification is public, so a decoder can always be rebuilt
      • it sits at the centre of the format ecosystem, with many documented relationships

      Confidence 61% · evidence coverage 100%

    • AI score

      92
      • open specifications are implemented by the open-source decoders that ML stacks rely on
      • the specification is published openly
      • a broad range of applications read and write it
      • large lossless payloads cost bandwidth and memory

      Confidence 48% · evidence coverage 100%

    • Compatibility score

      92
      • every major browser engine renders it natively
      • a broad range of applications read and write it
      • an open specification means cloud SDKs can implement it without licensing friction

      Confidence 62% · evidence coverage 75%

    • Photography score

      63
      • lossless data survives repeated open-edit-save cycles without degrading
      • it stores data losslessly, so files stay large

      Confidence 41% · evidence coverage 44%

    • Web score

      62
      • every major browser engine renders it natively
      • browsers render it natively, so no conversion step is needed at request time
      • the specification is published openly
      • it stores data losslessly, so files stay large
      • large lossless payloads cost bandwidth and memory

      Confidence 60% · evidence coverage 92%

    • Streaming score

      37
      • every major browser engine renders it natively
      • it stores data losslessly, so files stay large
      • large lossless payloads cost bandwidth and memory

      Confidence 54% · evidence coverage 63%

    • Performance score

      26
      • it stores data losslessly, so files stay large
      • large lossless payloads cost bandwidth and memory

      Confidence 50% · evidence coverage 100%

    What HTML is recommended for

    Every conclusion below is derived from the structured facts on this page — nothing is written by hand.

    • Browser compatibility100/100

      • Because every major browser engine renders it natively.
      • Because at least one shipping browser renders it.

    • Software compatibility100/100

      • Because a broad range of applications read and write it.
      • Because several mainstream applications support it.

    • Printing suitability100/100

      • Because lossless data means no compression artefacts appear at print resolution.
      • Because it is a page-description format built around fixed layout.

    • Cloud compatibility100/100

      • Because an open specification means cloud SDKs can implement it without licensing friction.
      • Because it converts into many other formats, which suits automated pipelines.

    • AI compatibility100/100

      • Because open specifications are implemented by the open-source decoders that ML stacks rely on.
      • Because lossless pixels avoid compression artefacts leaking into training data.
      • Because wide library support means common data loaders can read it.

    • Long-term archiving100/100

      • Because the specification is public, so a decoder can always be rebuilt.
      • Because lossless storage preserves the original data for future migrations.
      • Because it is a current, actively maintained format.

    • Professional editing100/100

      • Because lossless data survives repeated open-edit-save cycles without degrading.
      • Because professional applications read and write it.

    • Open standards100/100

      • Because the specification is published openly.

    • Licensing100/100

      • Because an openly specified format can be implemented without a licence negotiation.
      • Because the core patents are old enough to have expired.

    • Popularity100/100

      • Because it sits at the centre of the format ecosystem, with many documented relationships.
      • Because mainstream applications ship support for it.
      • Because it is still current rather than being phased out.

    • Future-proofing88/100

      • Because it is actively maintained and current.
      • Because open specifications outlive the companies that create them.
      • Because nothing in the graph supersedes it yet.

    What HTML is not recommended for

    • Compression efficiency0/100

      • Because it stores data losslessly, so files stay large.
      • Because its codec generation predates modern entropy coding and block partitioning.

    Related to HTML

    File extensions

    Media types

    Created by

    Compared with

    Data quality

    Every claim on this page is classified as a verified fact, a derived fact or an assumption.

    Overall confidence
    85%
    Verification status
    verified
    Last reviewed
    2026-08-03
    Verified facts
    2

    2 classified claims backed by 1 source.

    • Convert Always editorial review — Convert Always

    Sources and review status

    Review status: verified · confidence 80%

    Last reviewed 2026-08-03 (revision 1).

    • Convert Always editorial review — Convert Always